Check-valve.



R. F. KREITER.

CHECK VALVE.

APPLICATION FILED AUG. 15, 1905. BENEWED OCT. 2, 1908. 985,1 18.Patented sgpt. 28, 1909.

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7 A sw W 7 Nun aunar critic@ RICHARD F. KREITEB, 0F HOUSTON,TEXAS,ASSIGNOR TO MAHLON E. LAYNE, 0F

' HOUSTON, TEXAS.

CHECK-VALVE.

Specification of Letters Patent.

Application led August 15, 1905, Serial No.' 274,323. Renewed October 2,1908. Serial No. 455,852.

To all whom 'it may concern:

Be it known that I, RICHARD F. KREITER,

a citizen of the United States, residing at Houston, in the county ofHarris and State of Texas, have invented certain new and usefulImprovements in Check-Valves, of which or a casing the 'valve isrequired to prevent back flow around the inner member. rThe objects ofthe invention are, to provide an easily applied and removed back-flowvalve designed to engage outside a member passing through itg, toprovide an automatic flap-valve made in parts which will coperate andclosely confine the fluid around a pipe passing between the partsftoprovide improved means for manually opening a sectional check valve, andto provide for accurately seating and closing the same in position bymeans of the pressure, and to generally improve the structure andoperation of back pressure or check valves. These objects and otheradvantages hereinafter to appear, I attain by means of the constructionillustrated in a preferred formas applied to two concentric pipes, inthe accompanying drawing, wherein'- Figure'l is half a horizontalsection and a partial plan view ofthe valve casing, the secion beingtaken on line (l) in Figure 2.; an

Figure 2 is a central` vertical section through the casing and a portionof pipe confined by the valve. A,

In many positions such as in driving oil wells, or pumping, one pipe isinclosed in another and it is desired to intercept any upward flow ofwater or gas between the two pipes but to allow downflow. lt isconvenient to have an easily removable valve which will automaticallyengage the inner pipe to prevent flowing out of gas or water, but isopened easily downward. For this purpose it will be seen by the drawingthat ll have parts close the casing against gas or water in the smallerpipes indicated. The cover 5 of the casing has an open spaceconsiderably larger than the interior pipe 4 and to close it l haveprovided a pair of coperating semicircumferential valves 7 which aremounted upon trunnions 8 and having bearings 9 in the boxes G on thecasing, the bearings being adjusted to and from the center line of thepipe by means of adjusting screws 10. This trunnion 8 pivots the valve 7so that it may open downward, or close at against' the dependingannularflange 13 on the cover. rlhe valve may be opened manually when desiredby means of shafts llA ,elongated slit .in the trunnion 8 as seen inFigure 2. Y

rlhe top of the casing 3 being fixed on the end of a closed chamber 'orpipe, its downward depending annular.` rib 13 having a packing 14atherein engaging the' flat top surfaces of the two valves 7 closes thespace fully. rlhe valves have in their semi-circular faces a pair ofpacking rings 14 in order to' make a tight fit against the pipe 4, andby means of the screws 10 the bearing blocks of the pivoted valves maybe moved in order to properly adjust the contacting surfaces. A

By this device it will be seen that the back How from the lower side ofthe box 3 is effectually checked by an automatic valve which is removedwith perfect ease, and which allows of the central pipe 4 being pushedfarther down without obstruction when desired. The valves 7 are easilyadjustable to any desired position to accommodate variations in the sizeof the interior pipe and the whole valve may be readily removed byunbolting the top Harige. @ther advantages of the devicewill readilyoccur to those familiar with the art.

Having thus described my invention and illustrated its use, what l claimas new and desire to secure by Letters Patent, is the following:

1. rlhe combination of a partially closed casing and a sectional pivotedvalve mount-- ed therein and having its parts adapted to swing togetherin contact with the casing and with a pipe or rod running through thecasing and the valve.

2. rllhe combination with a casing provided with a chamber and a smallerpipe inside the same, of a partial closure plate for thel large chamberand a pair of semi-circumferential flap valves pivoted in the casing andadapted for engaging the interior pipe and the plate, substantially asdescribed.

3. In a check valve for wells the combina' tion with a supporting box 3,of a removable top to the boX having a depending annular ange forming aseat for thel valves, a pair of valves pivoted in said box adapted toengage the depending flange of th'e lid and also to engage a pipe placedinside of the boX, whereby the ilu-id pressure automatically closes thesaid 4valves against the pipe and against the said seat, substantiallyas. described.

4. In-a wellcheck valve the combination of a pair ofsemi-circumferential valves pivoted upon `adjustable trunnionsandradapted to swing against and away from valves and means for adjustablymounting them upon pivots in the casing, an operating stem looselyengaging slits in the valve trunnions and al packing boxl surroundingthey stem, whereby the valve may bev operated from outside of the valvecasing, tially as described. v

In witness whereof I have hereunto signed my name 4in the presence oftwo subscribed witnesses. y

RICHARD' F. KREITER. Witnesses W. I. HAMBLEN, J r.,` A. R. HAMBLEN.

substan-

